Molding concrete structures



March 9 1926.

J. B. MURRAY MOLDING CONCRETE STRUCTURES 4 Shets-$heet 1 Filed July 23, 1924 f-Jwwmtoi Josnw 5 Mummy 35 61bit I y /flm4/ March 9 192s. 1,575,929

J. B. MURRAY MOLDING CONCRETE STRUCTURES Filed July 23. 1824 4 Sheets-Sheet 4 avmeuto'c JOSEPH 5. Mu/WM Patented Mar. 9, 1926.

JOSEPH B. MURRAY, F BROOKLYN, NEW YORK.

MOLDING concnn'rn srn'ucrunns.

Application filed July 23, 1924. Serial No. 727,608.

To all whom it may concern:

Be it known that I, Josnrr-r B. MURRAY, a citizen of the United States, and resident of Brooklyn, county of Kings, and State of New York, have invented certain new and useful Improvements in Molding Concrete Structures of which the following is a specification.

The accompanying drawingsillustrate the 1 invention applied to the building of a reactor or reactance coil support.

Figs. 1, 2 and 3 are perspective views illustrating successive stages in the method; Fig. 3? is a modification in perspective;

Fig. 4 is a plan of a detail;

Fig. 5 is a longitudinal section throi'igh'the same;

Fig. 6 is a simliar section of a modification;

Figs.7, 8 and 9 are perspective views of alternative styles of core; I

Figs. 10 and 11 are end views of alternative styles of core.

In the application of Thomas E. Murray, No. 426,368 there is described a reactance coil in whichthe cable is embedded in amass of concrete, and a method of building up the concrete support with certain forms which are afterwards withdrawn.

The present invention is illustrated in connection with a similar type of reactor. But it will be understood that there is a great variety of reactors in which the support of concrete or similar plastic material is castabout the cables, and that my'invention is applicable generally to all such reactors and to a variety of other structures in which parts are to beheld in place while the concrete is cast about them.

. Referring to Fig. 1, a base 1 is cast with radial ribs 2 of concrete between which are triangular spaces formed with. sockets in which are disposed certain guide rods 3 extending upward to the calculated height of the reactor. On the triangular recesses of the base are placed in vertical succession removab e cores 4 with holes through which the rods 3 pass so as to position the cores.

Between the successivehorizontal courses of cores 4 are flat, or approximately flat, spirals of the conducting cable 5. The lowermost spiral is laid on the first course of cores. The second course of cores 4 is then set in place and the spiral of the cables is arranged thereon; this operation being re peated to the desired. height. The resulting structure thus far is shown in Fig. 1.

This structure is suitably enclosed and concrete is poured in the spaces between the columns of cores so as to embed the cables. The concrete structure is indicated in Fig. 2 in columns 6 between the columns of cores 4.

When the concrete has set, the cores 4 are withdrawn leaving the finished structure as in Fig. 3 with the cables 5 embedded in and supported by the concrete column sections 6 and ventilated in the open spaces between such sections. According to the design and intended use, the concrete portions may be made larger or smaller in proportion to the vertical spaces separating. them.

Fig. 4 shows in plan one of the cores 4 with the cables 5, overlying it, and Fig. 5 shows a section of the same. The cores are preferably made of rubber. When the rods 3 are withdrawn by lifting them out of the sockets in the base 1, the rubber cores can be withdrawn by merely pulling them outward in the direction of the arrow, Fig. 5. The cores should be of such a composition that when one is pulled lengthwise it will contract transversely suiiiciently to permit its withdrawal from between the opposed cables 5 which embrace it at top and bottom and also from the concrete-sections 6. which embrace it at the sides. A comparatively short pull on the end will result ina sufficient transverse contraction to detach; it from the surrounding walls, first near its outer end and then toward. the inner end until it is entirely loosened and can be easily withdrawn.

When the tension is released it resumes its original shape and may be usedagain. The pressure of the plastic concrete may be very considerable in the case of large reactors. The cores must be of. suflicient dimensions and composition to give them less diameter than the outer ends of the cores, as in Fig. 2, these outer ends are exposed so that they may be readily taken hold of to pull them out.

Fig. 7 illustrates in perspective a core such as is used in Fig. 1. It is a solid strip of rubber, wedge-shaped in plan, of a highly resilient composition such as that described in the prior applications above referred to. lVith a core of this sort the surface will be more or less indented where the cables 5 lie across them.

As shown in Fig. 8 the core 7 is made rectangular in cross-section and is provided on its top and bottom surfaces with transverse grooves 8 fitting the cables so that the two cores will come together about the intermediate coil of the cable 5, as in Fi 5, and prevent the entry of concrete into this space; so that the cables will be entirely separate when the cores are withdrawn.

In some cases the coils instead of being flat are more or less conical. The spaces between adjacent coils will then be tapered in vertical section alternately from the outside to the inside and from the inside to the outside. For the spaces that are tapered interial for the cores is preferred, yet they may bemade of various othermaterials, the

principal requirement being that they shall not be of such a composition as to absorb water from the cement and to be swollen or distorted in shape thereby. Various impervious artificial compositions are fitted for such use. r

For cores of larger sizes, even where the top and bottom are parallel, it is preferable to use hollow strips of rubber. For example, Fig. 10 is an end view of a wedgeshaped core 4 like that of Fig. 7 with a central opening 12 extending lengthwise through it or through any desired portion of its length. For some purposes it is possible to use a simple circular rubber tube 13,

- Fig. 11, as a core, this form being easily withdrawn. r

Fig. 6 is a vertical section of an unyielding Coreli. The'cables 5 betweenthese cores make no perceptible depressions therein. After the casting of theconcrete, they can'be knocked out from the inner ends. Such removal. will be facilitated by lubricating their surfaces. With cores of this sort, the spaces 15 between the cores in a column would be filled with concrete during the casting operation. This concrete would form permanent diaphragms or spacers extending between the several convolutions of each coil.

here hollow cores of rubber or similar flexible material are used, as in the shapes of Figs. 10 and 11 for example, asupporting or reinforcingmeansmay be introduced into the central opening to sustainthe pressure of the partswhile the concrete is being cast and while it is plastic, and may be removed before withdrawalof the cores so as to make it easier to contract them transversely. But I prefer to make them of such dimensions as to sustain the pressure without the aid of suchmandrels or reinforcing means. V i 7 vVhere flat toppedcoresare used they should be provided with holes 17 (Fig.7)

registering with the spaces between the successive convolutions of each spiral so'that vertical rods may be passed through the holes in the cores of successive courses to space the convolutions apart during the molding operation. I V

Fig, 3 illustrates a reactor built onthe same general principle as Fig. 3 butof different design. The reactoris a solidblock of concrete 15 with radial openings 16 left by cores which have been assembledwith the coils and embedded therewith in the concrete and afterwards withdrawn.

Though I have described with great particularity of detail certain embodiments'of my invention, yet it isnot to'be understood therefrom that the invention is restricted to the particular embodiments disclosed. Various modifications may be made by those skilled in theart without departure from the invention as defined in the following claims. i

VVhatI claim is:

1. In the building of a reactor, the method which consists in first setting up a plurality of coils of the cable with removable cores at intervals and then casting plastic material in a monolithic structure about said plurality of coils and said cores and thereafter removing the cores.

2. In the building of a reactor, the method which consists in first setting up a plurality of substantially horizontal coils of the cable with removable cores at intervals. between successive horizontal coils and then casting plastic material in a monolithic structure 7 iZonta-l coils of cable, so that said cores support the cableand hold the coils in position, casting plastic material around the coils in the spaces between the cores, and removing said cores in an endwise direction.

4. The method of building a reactance coil which consists in arranging the cable in a series of substantially or approximately horizontal coils supported and positioned at intervals by cores of resilient composition adapted when pulled endwise to contract transversely and when released to resume their shapes, casting concrete about the coils and cores and pulling the cores out.

5. The method of building a structure involving a body of plastic material with metal parts embedded therein which consists in supporting and positioning the metal parts by means of cores of resilient material adapted when pulled endwise to contract transversely and when released to resume their shapes, casting the concrete about said metal parts and cores and pulling the cores out endwise.

6. A spacing device for the cables of reactance coils comprising a core of resilient material adapted when pulled endwise to contract transversely and when released to resume its shape, said core being of such length as to extend radially across the space between two adjacent horizontal coils and to properly space and temporarily support them and adapted to be withdrawn when the coils are permanently supported.

In witness whereof, I have hereunto signed my name.

JOSEPH B. MURRAY. 

